USA HISTORY

Detailed explanation-1: -Scientists one theorized that the ancestors of today’s Native Americans reached North America by walking across this land bridge and made their way southward by following passages in the ice as they searched for food. New evidence shows that some may have arrived by boat, following ancient coastlines.

Detailed explanation-2: -During the peak of the last ice age, known as the Last Glacial Maximum, the low sea levels exposed a vast land area that extended between Siberia and Alaska known as Beringia, which included the Bering Land Bridge.

Detailed explanation-3: -The land bridge measured about 1, 000 miles north-to-south at its maximum extent. Climate change at the end of the Ice Age caused the glaciers to melt, flooding Beringia about 10, 000 to 11, 000 years ago and closing the land bridge.

Detailed explanation-4: -As of 2008, genetic findings suggest that a single population of modern humans migrated from southern Siberia toward the land mass known as the Bering Land Bridge as early as 30, 000 years ago, and crossed over to the Americas by 16, 500 years ago.

Detailed explanation-5: -It is widely believed that the first migrants to North America arrived approximately 14, 000 years ago, having trekked across a land bridge spanning the Bering Strait from Siberia to Alaska.